Smart distribution transformers revolutionise the electrical grid

Smart distribution transformers (iTrafos) revolutionise the electrical grid

The digitalisation of the electrical grid is driving the development of iTrafos, equipment capable of dynamically optimising voltage. TECNALIA makes its testing infrastructure available to manufacturers to validate these prototypes and accelerate their market launch.

The transition to a more flexible and decentralised energy system, marked by the massive integration of renewable energies, requires much more precise and dynamic voltage management than in the past. In this context, the so-called iTrafos, smart distribution transformers have emerged, representing a qualitative leap in the electrical distribution infrastructure.

About iTrafos and how they work

• The defining feature of iTrafos is the incorporation of an on-load tap changer ( or OLTC).
• Unlike conventional transformers, which require power interruption to adjust the transformer ratio, iTrafos can vary the output voltage automatically and in real time while the equipment remains in service.

Operational benefits of iTrafos for the electrical grid

This capability brings critical operational benefits to the grid:

• Efficiency optimisation: maintains voltage at optimum levels, reducing energy loss.
• Grid stability: facilitates the management of voltage fluctuations caused by distributed generation (such as solar PV).
• Supply quality: ensures that the end-user receives stable voltage, protecting connected equipment, increasing system reliability.

The implementation of a load regulator adds a layer of considerable mechanical and electrical complexity. The movement of the contacts under load generates arcing and thermal stresses that must be managed precisely to avoid catastrophic failure. Therefore, the transition from design to commercial deployment requires a thorough verification and validation process to ensure the safety and lifetime of the equipment under real stress conditions.

Accelerating market access for your iTrafos

To reduce technological risk and development times, TECNALIA has positioned itself as a strategic partner for manufacturers of iTrafos, offering its advanced testing capabilities to validate prototypes.

Thanks to our specialised infrastructure, companies carry out critical tests that are essential for certification and regulatory compliance. From validation of the changer's electromechanical behaviour to electrical performance testing, we provide accurate data required by manufacturers to optimise their designs.

We act not only as a test centre, but also as a technology enabler that enables the electrical sector to launch smarter, more robust and efficient solutions, accelerating the modernisation of global electrical grids.